metamorphic
Unakite
Unakite (altered granite)
Hardness: 6-7 (Mohs scale); Color: Mottled green and pink/orange; Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic; Cleavage: None/Irregular; Specific Gravity: 2.85-3.00
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green and pink/orange
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green and pink/orange; Luster: Vitreous to dull; Crystal structure: Monoclinic/Triclinic; Cleavage: None/Irregular; Specific Gravity: 2.85-3.00
Formation & geological history
Formed through the hydrothermal alteration of granite, where plagioclase feldspar is replaced by epidote. Usually associated with the Proterozoic eon in the Appalachian Mountains.
Uses & applications
Commonly used as a lapidary stone for beads, cabochons, carvings, and architectural accents like floor tiles or egg-shaped ornaments.
Geological facts
Named after the Unaka Mountains in North Carolina/Tennessee where it was first discovered. It is the state rock of Virginia.
Field identification & locations
Identified by its unique 'pistachio green' epidote mixed with 'salmon pink' orthoclase feldspar. Frequently found as pebbles in riverbeds or on beaches in the Blue Ridge province.
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